If you feed the same size of cut sheet from the cassette and from the tray, you will get different size borders for each feed source.
For instance, if you feed a letter size piece of paper from the cassette, you can have a border of about 1/8" on all four borders.
If you feed the same size paper from the tray (manual feed at top of printer), the printer will put a border of about 1/2" on the trailing edge of the paper.
Seems strange, as the printer will probably use the same feed mechanics in both cases.
I tried fooling the printer by telling it the paper was 1/2" longer than its real size (this works with Epson printers), but no luck. The printer detects the true paper size and overrides your attempt to fool it.
I want to print 17 x 22 cut sheets (310 GSM) with a 1/4" margin on top and bottom, but there does not seem to be a way to do this.
I'm probably missing something obvious. Any suggestions?